I need a word for an item in a game which is not actually damaged but needs maintenance or servicing (preemptively replacing worn parts ...), like they do on airliners after every so many hours of flight time.

My current best guess so far would be "a car needing maintenance".

I want to differentiate from a similar item not yet needing it. But this way too long. I was hoping for a two-word solution.

Update

The proposed scheduled maintenance is not what I was looking for - Maybe the comparison to Airliners was misleading.

I want an expression for the circumstance that my hypothetical car is, lets say, not trustworthy anymore. It is not damaged, but certainly needs an inspection or such and maybe preemtive repairs. But it is still in working order, I could not call it a damaged or broken car.

I was hoping for an adjective which summarises the state of the car: working, not trustworthy, but not broken though.

Update 2

Seems not to be so easy. Im German, we can just concatenate maintenance and need to (roughly-translated) maintenanceneedy. I was hoping for a similar word; but I guess I settle for beaten down which I guess is short enough and fits the circumstance well.

While not actually suggested, this got me to the idea that beaten down might be an appropriate phrase I could use! Thank you sir!
– user170684Apr 16 '16 at 23:00

I understand the term "lemon" to describe something that was unreliable or faulty due to poor design or manufacturing, rather than something that has become unreliable due to wear and lack of maintenance.
– Paul JohnsonApr 17 '16 at 14:20

@PaulJohnson Can you provide a reference? The two dictionaries I cited do not mention that the word signifies a particular reason for the unreliability.
– KyleApr 18 '16 at 7:18

Nothing very authoritative, but this article in Wikipedia describes the problems with new cars, although it also includes a description of newly-purchased second hand cars that somewhat undermines my argument. en.wikipedia.org/wiki/Lemon_%28automobile%29
– Paul JohnsonApr 18 '16 at 8:57

In the UK - and if I understand your requirement correctly - we would say that "it needs servicing" or "it needs a service".

But I note that you used "servicing" in your question, and I'm not clear why you rejected that word?

Altho' one is advised to have the car serviced at regular intervals, the expressions "needs servicing" and "it needs a service" do not imply only regular maintenance. It could need servicing (or even "need looking at" - which is more colloquial) because something seems wrong with the vehicle; or because it hasn't been used for a long time; or because a maintenance service (i.e. a regular service) is long overdue.

All items experience standard wear and tear. Some might be benefit from more routine maintenance, cleaning, or inspection. Like bikes, cars, power tools, etc. But i think we take extra care of them not because they're necessarily more fragile, but because it's critical that they operate correctly. So maybe you're looking for a term like "safety-critical item"

If you were supposed to have your mechanic perform certain tasks at, say, 100,000 km and your odometer reads 110,00 km, the maintenance is overdue.

The consequences of neglecting maintenance may be inconsequential for quite some time, perhaps increased engine wear due to a late oil change, but on the other hand the timing belt may snap leaving you with a possibly ruined engine and perhaps in the middle of a multi-lane freeway in the fog at night.

If it's hours on an aircraft engine rather than miles or km on an automobile, the plane is likely deemed to be no longer airworthy.

If there were a term "unairworthy" in my car-analogy (actually it is about robots, after performing a duty), it might be a choice. I would like to accept the two of you, but for now I will use a derivate of kyle's suggestions. Thank you still!
– user170684Apr 16 '16 at 23:02

The equivalent is "roadworthy", but in most cases there is no legal obligation to perform most types of maintenance on a non-commercial vehicle, so it's not really the same in most cases. An example where it would be similar would be a car with insufficient tread depth on the tires.
– Spehro PefhanyApr 17 '16 at 0:42

For the revised version of the question, I suggest run-down,
which means still running, not broken down,
but possibly close to breaking down.
MW defines it as “in very bad condition because of age or lack of care.”
Worn down is similar; “showing the effect of wear.”
Worn-out is more commonly used,
but it is widely taken to mean
“too old or damaged from use to be used any longer.”
However, it also can mean
“depleted of energy, strength, or enthusiasm,”
which suggests that it is repairable.

Tired and weary will be understood,
and are only a little anthropomorphic.
Decrepit can mean “impaired by use or wear”
and “fallen into ruin or disrepair,” but,
like the primary definition of worn-out,
has a connotation of the item being beyond repair.
(Oops; I just noticed that somebody else already suggested “decrepit”.)
Dilapidated is similar, and you can find a hundred more in a thesaurus.

My initial understanding of your question was
that you were contrasting items that (magically?) never need maintenance
with mundane items that do require occasional maintenance.
I would call the first type durable:
“able to resist wear, decay, etc., well; lasting; enduring.”
The Free Dictionary lists delicate, fragile, brittle,
perishable, breakable, and impermanent as antonyms;
but, for something like a car, you might be better off
with something like non-durable or less-durable.